CVE-2019-14834 Denial of service in dnsmasq

Low 3.7 Published 7 Jan 2020 Updated 5 Aug 2024

Remote attackers can cause denial of service via memory consumption in dnsmasq through crafted DHCP responses.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2019-14834?

CVE-2019-14834 is a low-severity denial of service vulnerability in Fedoraproject Fedora, published on 7 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability was found in dnsmasq before version 2.81, where the memory leak allows remote attackers to cause a denial of service (memory consumption) via vectors involving DHCP response creation.

Weakness: CWE-770

Which versions are affected by CVE-2019-14834?

It affects 2 products.

Linux distribution packages (28)

`dnsmasq` Red Hat:enterprise_linux:7::client	All versions	`0:2.76-16.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`0:2.76-16.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::client	All versions	`0:2.76-16.el7`
`dnsmasq` Red Hat:enterprise_linux:7::computenode	All versions	`0:2.76-16.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::computenode	All versions	`0:2.76-16.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::computenode	All versions	`0:2.76-16.el7`
`dnsmasq` Red Hat:enterprise_linux:7::server	All versions	`0:2.76-16.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`0:2.76-16.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::server	All versions	`0:2.76-16.el7`
`dnsmasq` Red Hat:enterprise_linux:7::workstation	All versions	`0:2.76-16.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`0:2.76-16.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::workstation	All versions	`0:2.76-16.el7`
`dnsmasq` Red Hat:enterprise_linux:8::appstream	All versions	`0:2.79-11.el8`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`0:2.79-11.el8`
`dnsmasq-debugsource` Red Hat:enterprise_linux:8::appstream	All versions	`0:2.79-11.el8`
`dnsmasq-utils` Red Hat:enterprise_linux:8::appstream	All versions	`0:2.79-11.el8`
`dnsmasq-utils-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`0:2.79-11.el8`
`dnsmasq` SUSE:HPE Helion OpenStack 8	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:Linux Enterprise Desktop 12 SP4	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:Linux Enterprise Server 12 SP4	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:Linux Enterprise Server 12 SP5	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:Linux Enterprise Server for SAP Applications 12 SP4	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:Linux Enterprise Server for SAP Applications 12 SP5	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:OpenStack Cloud 7	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:OpenStack Cloud 8	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:OpenStack Cloud 9	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:OpenStack Cloud Crowbar 8	All versions	`2.78-18.12.1`
`dnsmasq` SUSE:OpenStack Cloud Crowbar 9	All versions	`2.78-18.12.1`

Products include Fedoraproject Fedora, Thekelleys Dnsmasq.

How do I fix CVE-2019-14834?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-14834 being exploited?

There is no known exploitation of CVE-2019-14834 in the wild and no public exploit code.

All Fedoraproject Fedora vulnerabilities

Sources

Also known as ALPINE-CVE-2019-14834, CLEANSTART-2026-VX51931, CVE-2020-20145, DEBIAN-CVE-2019-14834, GHSA-rwmq-3523-q2pg, MGASA-2019-0392 and 5 more.